【不看就輸了】他們是用生命在跳水!!
Polystyrene - Wikipedia, the free encyclopedia 抱歉...我笑了!Polystyrene (PS) /ˌpɒliˈstaɪriːn/ is a synthetic aromatic polymer made from the monomer styrene. Polystyrene can be solid or foamed. General purpose polystyrene is clear, hard, and rather brittle. It is an inexpensive resin per unit weight. It is a rather...
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